Fix W3C strings with null terminator

Author: cedelavergne-ledger

src_features/provide_tx_simulation/cmd_get_tx_simulation.h

@@ -32,8 +32,8 @@ typedef struct tx_simu_s {
     uint64_t chain_id;
     const char tx_hash[HASH_SIZE];
     const char domain_hash[HASH_SIZE];
-    const char provider_msg[MSG_SIZE];
-    const char tiny_url[URL_SIZE];
+    const char provider_msg[MSG_SIZE + 1];  // +1 for the null terminator
+    const char tiny_url[URL_SIZE + 1];      // +1 for the null terminator
     const char addr[ADDRESS_LENGTH];
     const char partner[PARTNER_SIZE];
     tx_simulation_score_t risk;